Arrangement for tiltable furnaces



Dec. 29,1964 F. K. EIJOHANSSON ETAL 3,

ARRANGEMENT FoR TILTABLE FURNACES Filed May 2, 1962 5 Sheets-Sheet 1 Fig.1

f e I INVENTORS Fol/(e Karl EUaic/ Jolvcmss n Sven ErLk Bergsiaram BY W ,JWA m/M ATTORNEYS Dem 1964. F. K. E. JOHANSSON ETAL 3,163,696

ARRANGEMENT FOR TIL-TABLE FURNACES Filed May 2, 1962 Fi 2 5 Sheets-Sheet 2 HI: I I ll 18 Fig. 3

I INVENTORS oL/ Karl EUalc/ Johnmsson Sven Erik Bergstr'o'm ATTORNEYS Dec. 29, 1964 F. K. E. JOHANSSON ETAL 3,163,696

ARRANGEMENT FOR TILTABLE FURNACES Filed May 2, 1962 5 Sheets-Sheet 3 r 7 Fig.4

l 3 1 v 4 A 4 ,4 3 v $2 32 L. 33 4 A INVENTUR S Folks. kaJ-L EUQlC/ Johan 5.50 n

Sven Erik Ber strdm ATTORNEY s Dec. 29, 1964 F. K. E. JOHANSSON ETAL 3,163,696

ARRANGEMENT FOR TILTABLE FURNACES Filed May 2, 1962 1 5 Sheets-Sheet 4 Fig.7

VJA 1 INVENTORS WM aw 3,1

ATTORNEY S Dec. 29, 1964 F. K. JOHANSSON ETAL 3,153,595

ARRANGEMENT FOR TILTABLE FURNACES Filed May 2, 1962 5 Sheets-Sheet 5 9 cn ch g o u- 6% II N l \f m INVENTORS Folke KCU'I. Evaicl Jo/mmsson Sven Erik'Ber sfrb'rn BY W JWXOPMM ATTORNEYS ARRANGEMENT FGR TILT-ABIJE'ACES Folke KarlEvald Johansson and Sven-Erik Bergstriim,

Boriange, Sweden, assignors to Stora Kopparhergs Bergslags. A-ktiebolag, Ealun, Sweden, a-company of Sweden.

Filed May 2, 1962, Ser. No..1 93,tl59 vClall'ums priority, application. Sweden, May 9, 1961,

' 4,911/61 Claims. (Cl."26'.3 6)

Ti-ltable, rotating furnaces consisting of a furnace body, rotating in atil table. frame have-found'increasing use for. metallurgical processes, especially the refining of molten: pigviron. to steeli The: furnace body is then,

usually, provided withru-nning or tread" rings, supported by rollersnin the tiltable frame.

In. order that the. production may continue without interruption for rebricking of the refractory lining of the furnace', tw'o furnace bodies provided with tread rings are often used with the same rotary stand whereby one is beingused while the other one is being rebricked. However, certain difiiculties have been encountered be cause the tread rings must bewornin against the'support rollers in order to obtain a quiet operation. The reason for thisisthatminor differencesin the dimensions of the tread rings and their locations on the furnace body are unavoidable.

According to-the invention, the furnace body is removably arranged in -a rotary, tiltable carrier which can be a ring shaped unit provided with .one or more. tread (running) rings. In-this manner, only the furnace body has to be exchanged while the running rings whichare permanently connected with the ring shaped unit do not have to be changed. The ring'shaped unit should be provided with suitable devices forcentering and fixing. the furnace body in the carrier.

The inventionwill now be further described in connection with certain-design examples, shown in the attached drawings.

On the drawings:

FIG. 1 shows'diagrammatical-ly a total view of adesign in accordance with the invention, seen from the side and with the furnace body lifted up. FIG. 2 and FIG. 3 show a furnace bodywith diflerent support members in accordance with the invention. FIGS; 4 and 5 show, in longitudinal and cross section, parts of a fastening arrangement in accordance with the invention. FIG. 6 in combination with FIG. 7 showstwo longitudinal sections through an alternative design in a holder arrangement with bolt connections and FIGS; 8 and 9 show a further alternative design with a lever attachment.

FIG. 1 shows how the furnace body l hang-ing in wires, chains or lifting yokes, attached to the lifting lugs 2 which are welded to the mouth section of the furnace, may be lifted up or lowered into the ring shapedholder 3. which, with its-tread'rings 4, is rotatably supported by the support and guide rollers 5 and 6 mounted in bearings 8 which are attached to the tilting frame). This frame is tiltably supported by the shafts 11 mounted in the bearing supports 12., In FIG. 1-, for the sake of clarity, only some of the supports and guide rollers have been shown which are required'in order to carry and guide the ring shaped holder. The tiltability of the frame 9 is indicated by the gear 13. The furnace body 1 can be arbitrarily fixed in the ring unit 3 whereby it must be taken into account that the furnace is subject to considerable thermal expansion both longitudinally and radially. Sometimes, it is advantageous to lift the furnace body with the bottom up which is indicated by the lifting lugs 2, attached to the bottom part of the furnace. If it is desired, the furnace body 1 can be moved into and out of the holder 3 from below which isindicated by the broken linefigure towards the bottom of FIG. 1.

The furnace body may then bemoved with'the aidof aplatform which can be raised or lowered. Thev holder 3 with a furnace body 1 attached can. be brought into rotating motion with the aid I of the imotors 14 which are driving one or more of the support and guide rollers 5 and. 6. InFIGfl, the; rollers 5 have. a supporting function when the furnace is in the horizontal position and the rollers 6 take up the axial load. Which rollers should be driven depends on the position in which it is desired to rotate the furnace body. I i' i 4 In accordance with theinvention the furnace body is fixed bya detachable clamping device in .the ring shaped frame. This must, firstly, allow a centering of the fur nace body and, secondly, permit its thermal expansion as the furnace body usually isfixed incold condition and thereafter is heated. V l i i Inaccordance with a preferred embodiment, the. furnace; body, according to the'invention, is; provided with circles of supports. which cooperate with support orv securing devices in the holder. These devices suitably comprise elastic or resilientelements which can take up the thermal expansion of the furnace body. It has proved particularly advantageousto provide one circle of supportswith surfaces which form an oblique angle with the longitudinal axis of the furnace body whereby the radial expansion of the furnace body is transformed to an axial slipping which is taken up by the elastic elements in the support or clamping devices. l

The attachments may, as is shown in FIGS. 2 and 3, consist of rings 18 and 19, or lugs (pads) 20 and 21. They can also consist of grooves in the furnace body. One of these circles serves to fix the furnace body axially,

while the others serve only to support the furnace body.

and keep it centered but they must permit a sliding in the axial direction during thermal expansion. Both functions may be combined in one and the same circle. In the figures only one circle of each kind has been shown. Theringl-Q. according to FIG. 2 has an oblique support surface which forms part of a cone. The lugs 21, according to FIG. 3 have oblique. side surfaces but may instead be made with an oblique upper surface in the same manner as ring 119. V

In the execution shownin FIGS. 4 andS, the, clamping devices consist of a radially adjustable supporter clamping jaws 24 and 25 respectively, which can be pressed by screws or wedges against the plane ring 18 and the bevelled ring 19. Correspondingly, the rings may be replaced with lugs in accordance with FIG. 3, that is if the lugs 21 have conical or tapered support surfaces. The, furnace body will be centered through these arrangements. The clamping jaws have been provided with guide lugs 27 and 28 respectively which pass through, openings in the ring-shaped holder 3. If the clamping jaws are to be. pressed in with wedges they are suitably placed in line with the openings? in the ringshaped holder. The shoulder ring 19 by havinga conical cross section functions as by the wedge-shaped lugs 21 cooperating with correspond ingly shaped supports or clamping devices in the holder 3 which are arranged to register with the interspaces between the lugs 21 and have such form that their oblique atented Des: 29, 1 .64.,

surfaces will come into contact with the corresponding side surfaces of two adjacent lugs 21.

The furnace body 1 may, if desired, be provided with grooves or recesses in which, for instance, wedge shaped clamping lugs may be fitted.

' FIG. 6 shows two sections A and B of a different embodiment of the fastening device. The fastening device to the left A is offset on the furnace body in relation to the fastening device to the right B which is shown in FIG. 7. In this manner, it is avoided that the shoulder stops catch when the furnace body is lowered into the ring shaped unit holder. The axial position of the furnace is fixed by the fastening device to the right (FIG. 6). The member 21 is a lug with an oblique surface which rests against the shoulder 35 of the ring shaped unit holder. The contact surface between the lug and the shoulder may be curved or fiat. In the former case the common contact surface forms part of the envelope surface of a cone, and in the latter case part of the surface of a pyramid, which later execution may be advantageous because it is easier to machine a flat surface. Furthermore the performance with flat surfaces has the advantage of being more effec tive in transmitting turning moments. The setting is done according to the execution of FIG. 6 with a wedge shaped block 37 which is placed in between two shoulders 36 and 3% by the bolt joint 39. In order to permit the wedge 37 to be pressed outwardly during the radial expansion of the furnace the bolt joint is suitably provided with any elastic insert, for instance, a cup spring assembly 41 between the wedge and the nut 42. Instead of the large lug 21, also on this side a wedge between two smaller shoulders similar to 38 and 36 can be used whereby the fastening device in FIG. 6B will be symmetrical. The arrangement to the left, FIG. 6A, permits motion in axial direction and shows two wedges 43 and 44 which are tightened in radial direction by an axial bolt joint 39. This is fitted, as shown in the figure, with a wedge 46 instead of a nut which facilitates a more rapid attachment and detachment. The wedges engage oblique shoulders 47 and 48. The contact surfaces between wedges and shoulders are plane, i.e. form parts of a pyramid, which is seen in FIG. 7.

In FIG. 8 another embodiment of the fastening device is shown. The shoulder 19 is a conical ring or wedge formed lug which fits against a conical surface on the ring 51 on the holder or ring shaped unit 3. The furnace is secured to the holder with an angle lever 52 which can be turned around a pin 53 in the ring unit and which presses against the shoulder 19 with a nose 54, and a lever 56 which can be turned around a pin 57 and presses against the circumferential surface on the shoulder or collar 18. Each lever has an arm 58 and 59 respectively which is resilient and fixed to the holder 3 with a bolt 61 and 62 respectively between two ears 63 and 64 respectively. Because the lever is elastic it permits some movement of the shoulder 19 relative to the holder 3. FIG. 9 shows, on a section of a ring unit, how the levers 52 and 56 have been placed between the openings 7 in the unit.

shoulder to slide in axial direction when the furnace body 65 expands. The thermal expansion in radial direction is 4 taken up by elastic inserts or the resilience of the lever respectively.

It is, of course, also possible to combine the above described executions for the fastening of the furnace in the ring unit, for instance, to use wedge connections for one circle of shoulder supports and levers for the other. Also, other executions which meet the requirements of rapid fixing and centering of the furnace body and which permits its thermal expansion in axial and radial direction can, of course, be used within the scope of the invention.

What is claimed is:

1. A tiltable rotary furnace which comprises a support;

a tilting frame pivotally mounted in said suport;

a ring-shaped holder;

at least one ring-member, including at least one tread ring, exteriorly secured to said ring-shaped holder; support and guide rollers and at least one drive member, rotatably mounted in said tilting frame, said drive .member engaging said ring-member; said ring-shaped holder being supported on and guided by said support and guide rollers and rotated by said drive member;

a furnace body adapted to be encircled by said ringshaped holder; and

a securing means, carried on said ring-shaped holder,

for centering said furnace body within, and detachably securing said furnace body in, said ring-shaped holder.

2. The rotary furnace defined in claim 1, in which said ring-member includes a cog-ring and in which said drive member includes a pinion cooperating with said cog-ring.

3. A tiltable rotary furnace as defined in claim 1, wherein said securing means includes shoulder members, carried on said furnace body, cooperating with fastening members carried in said ring-shaped holder.

4. A tiltable rotary furnace as defined in claim 1, wherein said securing means includes at least one shoulder member, carried on said furnace body, cooperating with fastening members carried in said ring-shaped holder, said member having a bearing surface which forms an oblique angle to the longitudinal axis of the furnace body, said fastening members comprising engagement members having surfaces complementary to and adapted to engage said bearing surface on said shoulder member.

5. A tiltable rotary furnace as defined in claim 4, wherein said fastening members comprise stop members attached to said ring-shaped holder and arranged to prevent substantial movement of said shoulder member relative to said engagement members axially of said furnace body along said bearing surface and wherein said stop members include elastic or resilient elements which provide for such limited relative movement for accommodation for thermal expansion and contraction of said furnace body within said ring-shaped holder.

References Cited by the Examiner UNITED STATES PATENTS 792,642 6/05 Williams.

984,877 2/11 Astrom 266-39 1,088,401 2/14 Bretaud 266-36 2,205,940 6/ 40 Astrom 266-39 3,031,177 4/62 Hofmeister 266-36 MORRIS O. WOLK, Primary Examiner.

MARCUS U. LYONS, Examiner. 

1. A TITLABLE ROTARY FURNACE WHICH COMPRISES A SUPPORT; A TILTING FRAME PIVOTALLY MOUNTED IN SAID SUPPORT; A RING-SHAPED HOLDER; RING, EXTERIORLY SECURED, TO SAID RING-SHAPED HOLDER; SUPPORT AND GUIDE ROLLERS AND AT LEAST ONE DRIVE MEMBER; ROTATABLY MOUNTED IN SAID TILTING FRAME, SAID DRIVE MEMBER ENGAGING SAID RING-MEMBER; SAID RING-SHAPED HOLDER BEING SUPPORTED ON AND GUIDED BY SAID SUPPORT AND GUIDE ROLLERS AND ROTATED BY SAID DRIVE MEMBER; A FURNACE BODY ADAPTED TO BE ENCIRCLED BY SAID RINGSHAPED HOLDER; AND A SECURING MEANS, CARRIED ON SAID RING-SHAPED HOLDER, FOR CENTERING SAID FURNACE BODY WITHIN, AND DETACH- 